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Lawsonite Lu-Hf geochronology: A new geochronometer for subduction zone processes

机译:Lawsonite Lu-Hf年代学:一种用于俯冲带过程的新型地球仪

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摘要

We present a new method for Lu-Hf geochronology using lawsonite, an index mineral of high-pressure, low-temperature metamorphism. The method uses common cation exchange chromatography to purify Lu and Hf from the sample and analysis by multicollector inductively coupled plasma-mass spectrometry. Lawsonite Lu-176/Hf-177 ratios are elevated and are similar to other minerals commonly used in Lu-Hf geochronology such as garnet or apatite. We obtain an age of 145.5 +/- 2.4 Ma for lawsonite-blueschist facies metamorphism at Ring Mountain within the Franciscan Complex, California, the lawsonite type locality. The age agrees well with published geochronology and thermochronology for the Franciscan Complex. The new method provides a powerful tool to investigate processes and time scales of blueschist to eclogite facies metamorphism, crust-mantle recycling via subduction, and the geodynamics of convergent margins.
机译:我们提出了一种新的方法,用于使用law石(一种高压,低温变质的指示矿物)进行Lu-Hf年代学。该方法使用普通阳离子交换色谱法从样品中纯化Lu和Hf,并通过多收集器电感耦合等离子体质谱法进行分析。钙钠榴石的Lu-176 / Hf-177比率提高,并且类似于Lu-Hf年代学中常用的其他矿物,例如石榴石或磷灰石。我们在加利福尼亚方济各岩群中的方岭山脉地区的菱山-蓝胶岩相变质作用中获得了145.5 +/- 2.4 Ma的年龄。这个年龄与方济各会综合体的已出版的地球年代学和热年代学非常吻合。该新方法提供了一个强大的工具,可用来研究blueschist到榴辉岩相变质的过程和时间尺度,通过俯冲的地幔幔循环以及收敛边缘的地球动力学。

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